Strong's Concordance

Original word: ἡσύχιος
Transliteration: hésuchios
Definition (short): quiet
Definition (full): tranquil

NAS Exhaustive Concordance

Word Origin: a prol. form of hésuchos (still, quiet)
Definition: tranquil
NASB Translation: quiet (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

A prolonged form of a compound probably of a derivative of the base of hedraios and perhaps echo; properly, keeping one's seat (sedentary), i.e. (by implication) still (undisturbed, undisturbing) -- peaceable, quiet.

see GREEK hedraios

see GREEK echo

KJV: For kings, and for all that are in authority; that we may lead a quiet and peaceable life in all godliness and honesty.
NASB: for kings and all who are in authority, so that we may lead a tranquil and quiet life in all godliness and dignity.
KJV: But let it be the hidden man of the heart, in that which is not corruptible, even the ornament of a meek and quiet spirit, which is in the sight of God of great price.
NASB: but let it be the hidden person of the heart, with the imperishable quality of a gentle and quiet spirit, which is precious in the sight of God.